U.S. patent number 3,789,988 [Application Number 05/341,070] was granted by the patent office on 1974-02-05 for apparatus for removing surface pollutants from water and other liquids.
This patent grant is currently assigned to Societe Grenobloise d'Etudes et d'Applications Hydrauliques (Sogreah). Invention is credited to Jacques Pichon, Bernard Valibouse.
United States Patent |
3,789,988 |
Valibouse , et al. |
February 5, 1974 |
APPARATUS FOR REMOVING SURFACE POLLUTANTS FROM WATER AND OTHER
LIQUIDS
Abstract
The apparatus disclosed herein for removing layers of
pollutants, such as l, floating on a heavier liquid, especially
water, depends for its operableness on the effect of the relative
displacement speed of the heavier liquid and the overlying
pollutant. Such relative speed is used to direct the removed layer
of heavier liquid and pollutant, by tangential introduction, into
at least one cyclone chamber wherein the induced rotation of the
removed materials is caused as to create a whirlpool area in which
the pollutant is concentrated. In the central portion of such
concentration, the pollutant is extracted through a pipe fitting in
the axis of and crossing the ceiling of the cyclone. The
centrifuged water, free of pollutant, is discharged at the end of
the cyclone.
Inventors: |
Valibouse; Bernard (Grenoble,
FR), Pichon; Jacques (Saint Martin-d'Heres,
FR) |
Assignee: |
Societe Grenobloise d'Etudes et
d'Applications Hydrauliques (Sogreah) (Grenoble (Isere),
FR)
|
Family
ID: |
26215991 |
Appl.
No.: |
05/341,070 |
Filed: |
March 14, 1973 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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185719 |
Oct 1, 1971 |
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Foreign Application Priority Data
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Nov 6, 1972 [FR] |
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7239209 |
Oct 2, 1970 [FR] |
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7036478 |
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Current U.S.
Class: |
210/242.3;
210/512.1 |
Current CPC
Class: |
E02B
15/107 (20130101) |
Current International
Class: |
E02B
15/04 (20060101); E02b 015/04 () |
Field of
Search: |
;210/84,170,242,512,DIG.21 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Adee; John
Attorney, Agent or Firm: John J. Hart et al.
Parent Case Text
This application is a continuation-in-part of application Ser. No.
185,719 filed by the applicants on Oct. 1, 1971 now abandoned.
Claims
1. Apparatus for the removal of a pollutant floating on a body of
water, comprising a cyclone device adapted to be supported in
relative movement with the body of water to receive the pollutant
and water and when so supported in the body of water with a
sufficient displacement speed therebetween being capable of
receiving a water-pollutant mixture directly therein and of causing
the rotation of such mixture therein to a degree sufficient to
create a separation of the pollutant from the water, said cyclone
device comprising a casing defining a cyclone chamber free of
internal rotatable vanes and having an enlarged end and a reduced
end, a side of the enlarged end of said chamber being exposed to
entry of the relatively moving body of water through a large entry
opening located under the free surface of the body of water for
receiving directly into said chamber a water-pollutant mixture from
such body of water, said casing including a solitary wall located
externally of said enlarged end and associated with one side of
said entry opening and provided with a mixture directing surface
disposed in substantial parallelism with the longitudinal axis of
said chamber, said solitary wall projecting outwardly from said
enlarged end in opposed relation to the direction of entry of the
water-pollutant mixture and said directing surface of said wall
being generally inclined outwardly away from the other side of said
opening so as to direct the water-pollutant mixture into said
enlarged end to one side of said longitudinal axis and to coact
with the interior surface of said casing defining said enlarged end
to create within said chamber using solely the effect of such
displacement speed on the entering mixture, a whirlpool condition
capable of concentrating the pollutant in the central area of the
enlarged end of said chamber, means for extracting the pollutant
from such central area and through the enlarged end of the cyclone
chamber along the longitudinal axis of such chamber, means for
collecting the extracted pollutant, and means for returning the
pollutant free liquid from the reduced end of said chamber to said
body of liquid.
2. Apparatus as defined in claim 1, in which said directing surface
of said solitary wall is concavely-shaped outwardly from said one
side of said
3. Apparatus as defined in claim 1, in which casing includes a wall
in the enlarged end of said chamber having a mixture directing
surface concavely curved around the longitudinal axis of said
chamber, and a plane mixture directing surface extending outwardly
from the entry end of said curved surface and disposed so that the
surface of said solitary wall diverges outwardly therefrom in
spaced relation and against which the latter directs the
water-pollutant mixture to be directed by said plane surface onto
said concavely curved surface and around said longitudinal axis
of
4. Apparatus as defined in claim 1, including a second solitary
wall located externally of said enlarged end and associated with
the other side of said entry opening, said second solitary wall
having a mixture directing surface disposed in substantial
parallelism with the longitudinal axis of said chamber and together
with the mixture directing surface of said first mentioned solitary
wall forming a converging passage for the water-pollutant mixture
directed thereby to said entry opening.
5. Apparatus as defined in claim 4, in which the mixture directing
surface of said second solitary wall is substantially tangential to
the casing
6. Apparatus as defined in claim 4, in which said sides of said
entry opening have a length substantially less than the transverse
dimensions of said solitary walls and in which said entry opening
is spaced from said extracting means and from those longitudinal
edges of said solitary walls
7. Apparatus as defined in claim 4, in which that end edge of said
entry opening spaced furthest from said extracting means is
adjacent to one longitudinal edge of each of said solitary walls,
and including deflecting means mounted on said one longitudinal
edges of said solitary walls and coacting with the latter to direct
the water-pollutant mixture to said
8. Apparatus as defined in claim 7 in which said deflecting means
comprises flanged walls projecting in opposed relation from said
one longitudinal edge of said solitary walls and having mixture
directing surfaces perpendicular to the mixture directing surfaces
of said solitary walls.
9. A unit mountable on a hull for the removal of pollutant floating
on a body of water, comprising a cyclone device having a casing
defining a cyclone chamber free of internal rotatable vanes and
including an enlarged end and a reduced end, a side of the enlarged
end of said chamber having an opening for entry of a
water-pollutant mixture from the body of water directly into said
chamber, a pair of solitary walls located externally of said
cyclone device and connected at one end thereof to said cyclone
casing at the sides of said entry opening, said solitary walls
projecting outwardly from said entry opening in spaced relation and
having opposed mixture directing surfaces disposed in substantial
parallelism with the longitudinal axis of said chamber and inclined
relative to each other to provide a converging passageway to said
entry opening, said solitary walls coacting with the interior
surface of said casing, when said unit is mounted on a hull with
said solitary walls projecting from said cyclone casing in opposed
relation to the direction of entry of the water-pollutant mixture
and with said entry opening submerged below the free surface of the
body of water, to create within said chamber using solely the
displacement speed of the entering mixture relative to said cyclone
device, a whirlpool condition capable of concentrating the
pollutant in the central area of the enlarged end of said chamber,
outlet means at the enlarged end of the cyclone chamber for
removing the pollutant from such central area thereof along the
longitudinal axis of such chamber, and an outlet in the reduced end
of said chamber for the
10. A unit as defined in claim 9, in which the directing surface of
one of said solitary walls is tangential to the casing wall at a
side edge of said entry opening and disposed as a whole at right
angles to a radial plane containing the longitudinal axis of said
chamber and said opening
11. A unit as defined in claim 10, in which the directing surface
of the other of said solitary walls is concavely shaped outwardly
from the other
12. A unit as defined in claim 9, including deflector walls
projecting in opposed relation from the longitudinal edges of said
solitary walls spaced furthest from said outlet means, said
deflector walls having mixture directing surfaces perpendicular to
the mixture directing surfaces of said solitary walls.
Description
THE INVENTION
The present invention is concerned with equipment for removing
layers of floating pollutant products from heavier liquids,
particularly oil from a body of water.
The process may be practiced by using equipment towed or pushed by
a ship, or mounted on or built into a ship or a floating carrier,
or established in a static condition in a moving body of water such
as a river. Whichever manner in which the equipment is used, a top
layer of suitable thickness of the body of water is collected by
relying solely on the effect of the relative speed of displacement
of the water and the floating pollutant. The relative displacement
speed of the removed layer of water and floating pollutant is used
to direct such materials into one or several cyclone chambers
through a tangential inlet so as to cause within each such chamber
a rotation of such materials such as to create a whirlpool area in
which the lighter pollutant is concentrated. The pollutant is
extracted from the central portion of such area through a fixed
pipe whose axis is coincident with that of the cyclone chamber and
which transverses the ceiling of such chamber. The centrifuged
water, freed of the pollutants, is discharged through the tip of
the cyclone chamber. One advantage of this process is that its
efficiency increases as the relative displacement speed increases,
thereby enabling rapid purification of a stretch of water. It is to
be realized however, that this speed must be compatible with the
behavior of the apparatus in a particular sea area.
In accordance with one form of the invention, the apparatus or unit
for carrying out the process may include two walls forming a
convergence at the place of entry of the pollutant and water into
the cyclone chamber, or chambers. At the downstream end of the
convergence formed between such walls, there may be provided a
horizontally pivotal articulated blade whose outer, upper end forms
a scoop which cuts from the body of water a top layer of suitable
depth containing both water and the floating pollutant, and
channels it into chambers forming vertical axis cyclones. These
cyclone chambers are constructed so as to form whirlpool areas
having vertical axes of rotation and in the upper portions of which
the pollutant is concentrated. The upper part of the chambers are
each formed by a wall provided with a central opening in which is
fitted a vertical pipe which penetrates to a considerable depth
into its associated chamber and extends slightly above such wall.
The pollutant concentrated in the upper portion of each cyclone
chamber is extracted completely free of water through its
associated pipe and is discharged into and stored in a recipient
which is common to both chambers. The water leaving the lower point
or tip of each chamber is discharged through a pipe back into the
body of water.
In accordance with another form of the invention the apparatus is
constituted of a single cyclone body having associated therewith
inlet means consisting of two vertical walls defining a tapered
area leading the mixture to the inlet orifice of the cyclone. This
compact unit has the advantage that it can readily be mounted on
the sides of a ship, or on a stationary float in a natural or
artificial flow of water.
It will be appreciated that the above described arrangements are
especially appropriate for equipment which will, during its usage,
be towed or pushed by a boat, or built into or fitted to the sides
of a boat, or be statically fitted in a river. When apparatus
embodying the invention is to be used with hydropters or hydrofoils
where high displacement speeds are developed, horizontal axis
instead of vertical axis cyclones may be employed. Such horizontal
axis cyclones would in accordance with the invention have
tangential entries fitted with scoops arranged to penetrate the
layer of water and pollutant and channel the latter into such
cyclones. The operation within these horizontal cyclone chambers,
however, as well as the discharge of the pollutant and of the water
freed from the pollutant, would be substantially similar to that
described in connection with the vertical cyclone chambers.
Four embodiments of the above discussed types of apparatus are
shown by way of example in the accompanying drawings, in which
FIG. 1 is a vertical sectional view of equipment having two
chambers formed to provide two vertical axis cyclones; the view
being taken along the line 1--1 of FIG. 2;
FIG. 2 is a plan view of the equipment shown in FIG. 1;
FIG. 3 is a vertical sectional view of equipment having two
chambers formed to provide two horizontal axis cyclones; the view
being taken along the line 3--3 of FIG. 4;
FIG. 4 is a horizontal sectional view taken along the line 4--4 of
FIG. 3;
FIG. 5 is a perspective view of a compact unit embodying the
invention;
FIG. 6 is a vertical sectional view of the unit of FIG. 5, the
section being taken along the line 6--6 of FIG. 8 and omitting the
tangential guide wall of the unit to show the inlet opening of the
cyclone;
FIG. 7 is an end view of the unit of FIGS. 5 and 6 and illustrates
one method of mounting it on a ship;
FIG. 8 is a top plan view of the parts shown in FIG. 7; and
FIG. 9 is a top plan view of a modified form of the unit of FIGS.
5-8.
The equipment shown in FIGS. 1 and 2 of the drawings is composed of
a unit 10 constructed to be towed through a body of water 11 in the
direction indicated by the arrow F and into an area of the surface
of such water body that is to be cleaned of a surface floating
layer 12 of pollutant, for example, a liquid such as oil. The unit
may be towed by providing suitable means thereon in a known manner
by which tow ropes may be attached thereto for towing the same by a
boat. The unit 10 is provided with two forwardly projecting
vertical walls 13,13 shaped to form a convergence for directing the
skimmed pollutant and water into the entry end of the body of the
unit. The walls 13,13 are pivotally connected to the unit body by
vertical shafts 14,14 and may be adjustably positioned relative to
the unit body to further increase the pollutant intake area of the
unit by adjustment of two rods 15,15 which are pivotally connected
at their outer ends to lugs 16,16 provided on the walls 13,13 and
which are releasably secured to the unit body by suitable fastening
devices 17, 17 mounted thereon.
The entry end of the unit body is located at the downstream end of
the convergence formed by the two forwardly projecting vertical
walls 13,13 and comprises a blade 20 which is mounted for pivotal
movement on a horizontal shaft 21. It will be noted in FIG. 1 that
the hinged end of the blade 20 is located substantially below the
surface of the water body 11 and that the blade curves upwardly
from its hinged end in an arcuate manner to a given point below the
surface of the water. The position of the outer upper end of the
blade 20 may be varied by the adjustment of a rod or rods 22
pivotally connected to a lug or lugs 23 provided on the blade 2 and
adjustably secured to the entry or front wall 24 of the unit by
suitable fastening devices 25 mounted thereon. It will thus be
understood that the lip of the blade 20 forms a scoop which skims a
selected thickness of a mixture of pollutant and water from the top
of the body of water 11 using solely the speed of the unit relative
to the body of water. The thickness of the skimmed mixture will
correspond to the adjustment of the height of the blade 20 and such
mixture will be constituted of a portion of the pollutant layer 12,
and the part of the layer 26 of the water underlying such portion
of the pollutant layer 12. It will also be noted in FIGS. 1 and 2
of the drawings that the blade 20 and front wall 24 of the unit,
together with suitably configured wall portions 27, 28, 29, 30 and
31 form two vertical axis cyclones 32 and 33, and that the width of
the blade 20 and the relative speed is such, that the mixture of
pollutant and water is tangentially induced into such cyclones 32
and 33 to cause rotation of such mixture. This is indicated by the
dotted portions of the flow lines in FIG. 2, which show the liquid
flowing into the two cyclones tangentially to the two faces of the
central wall portion 27 and then being caused to whirlpool in
opposite directions by the walls forming such cyclones. As a result
of the rotation of the liquid mixture in the cylones 32 and 33,
there are created in the whirlpool areas thereof central
concentrations 34 and 35 of the pollutant. The volume of the
central concentrations 34 and 35 will increase with an increase in
the displacement speed of the equipment relative to the body of
water. The pollutant liquid which constitutes the central zones 34
and 35 of the cyclones, is completely separated from the underlying
water through pipes 36,37 located in the central portions of the
ceilings 38, in FIG. 1, of the cyclones. This discharge of the
pollutant from the cyclones is indicated in FIG. 1 of the drawings
by a series of arrows F1 which show the pollutant being sucked up
through the pipe 36 and discharged over the ceiling wall 38 of the
cyclone chamber and into a storage chamber 39 formed in the unit.
As previously stated the axes of the vertical pipes 36,37 are
coincident with the axes of the cyclones 32,33. As shown in FIG. 1,
the pipes 36,37 extend for a substantial distance toward the bottom
of the cyclone chambers and project only slightly beyond the upper
surface of the ceiling walls 38. In certain situations, the
discharge through the pipes 36,37 may be increased by associating
them with suction pumps in a manner known to the art.
The water that collects in the bottom of the cyclones 32 and 33 is
sucked off and discharged through pipes 40 and 41 which
respectively communicate with the tips of such cyclones and conduct
the water in the direction of the arrows F2 toward the rear of the
unit for reentry into the body of water 11.
As has been previously indicated, the above described apparatus
instead of being towed may be fitted to the front or rear of a
ship. In the latter case, the ship would be moved in reverse to
remove the layer 12 of floating polluting liquid. Where it is
necessary to clean a moving body of water, such as a river, of a
floating pollutant, the apparatus could be placed in the water
course so that the river current speed is utilized in the
introduction of water and pollutant into the equipment which would
operate in the manner above described to remove the pollutant from
the water.
FIGS. 3 and 4 of the drawings show how the unit may be constructed
to provide horizontal axis cyclones for separating the pollutant
liquid from the water. This type of construction is preferred in
units which are moved at high speed, such as when the units are
built into hydropters or hydrofoils. As is indicated in FIG. 3, the
mixture of water and pollutant skimmed from the surface of the body
of water 11 being cleaned is induced at high speed in the direction
of the arrows F3 into at least one horizontal axis cyclone provided
in the cleaning apparatus fitted in or built into the ship. When
several horizontal axis cyclones are used they are grouped together
in the same cleaning apparatus. FIGS. 3 and 4 of the drawings show
a horizontal axis cyclone formed by cleaning apparatus 46 built
into a high speed boat 47. As in the previously described apparatus
the water and pollutant mixture is skimmed from the body of water
by a scoop 48 hingedly connected to the enlarged entry end 49 of
the cyclone by a horizontal shaft 50. The scoop is adjustable about
shaft 50 to vary the thickness of the liquid being skimmed off the
top of the water body 11 by any suitable means, such as the members
22,23 and 25 shown in FIG. 1 of the drawings. It will be understood
that due to the high induction speed of the skimmed liquid mixture,
the effect of gravity on the two components thereof in the cyclone
becomes insignificant compared with the centrifugal action. Thus, a
horizontal axis control zone 51 containing the pollutant liquid is
formed in the cyclone, while the water is centrifuged toward the
walls of the cyclone. As in the previously described construction,
the pollutant centrally concentrated in the cyclone is drawn off
through a pipe 52 fixed in the axis of the cyclone and projecting
through the cyclone end wall 53. The pollutant sucked out through
the pipe 52 is discharged into a suitable receptacle 54 forming
part of the cleaning apparatus, as indicated by the arrow F1 in
FIG. 4. The water forced toward the tip end 55 is discharged into a
suitable pipe 56 which returns it to the body of water.
In FIGS. 5 to 9 of the drawings are shown compact units embodying
the invention and which are particularly suitable to be mounted on
floats, or on either side of a ship, such as a trawler, or a light
tanker. As is shown in FIGS. 5-8 of the drawings, such a compact
unit is constituted of a cyclone 60 of the type previously
described and having an inlet orifice 61, a clear water outlet 62
at the base of the cyclone and a pollutant outlet 63 at the upper
portion of the cyclone. The upper outlet 63 is equipped with a pipe
64 which extends axially into the cyclone in the manner of the pipe
36 shown in FIG. 1 of the drawings. The pipe preferably is
connected to suitable pumping means 65 for delivering the pollutant
to a stocking reservoir 66 mounted on the float or ship to which
the unit is attached.
Mounted on the cyclone 60 are two spaced, solitary walls 70, 71 of
substantially equal length and designed to guide the
pollutant-water mixture into the inlet orifice 61 so as to produce
rotational movement of the mixture within the cyclone by the
relative motion of the cyclone and the water. Wall 70 is a linear
vertical wall providing a plane vertical guide surface 72 which is
tangential to the casing wall of the cyclone 60 at one vertical
edge 73 of the orifice 61. Wall 71 is spaced from wall 70 and has
an inner curved surface 74, which at its outer end is spaced from
surface 72 a distance approximately the same as the transverse
diameter of the cyclone, and which at its inner end coincides with
the other vertical edge 75 of the orifice 61. As shown more clearly
in FIG. 8, the orifice edge 75 is spaced from the surface 72 a
distance less than the transverse radius of the cyclone. As
indicated in FIGS. 6 and 7, the lower edge 76 of the orifice 61 and
the lower edges of the vertical plane surface 72 and the vertical
curved surface 74 are substantially in the same horizontal plane.
The upper orifice edge 77 is located approximately midway of the
height of the plane surface 72. The walls 70 and 71 preferably are
provided along their lower edges with inturned flanges 80 and 81,
respectively. The upper surfaces of the flanges 80,81 are
perpendicular to the associated side surfaces 72 and 74,
respectively, and function in the nature of deflectors or guides;
cooperating with the side surfaces 72 and 74 to guide the flow of
liquid to the inlet orifice 61. As illustrated, the deflector wall
80 may be of substantially equal width throughout its length, while
deflector wall 81 may be made progressively smaller in width toward
the inlet orifice 61.
As shown in FIGS. 5, 7 and 8, the unit may be attached to one side
of a float or ship 82, by bracket means 83 secured to the upper end
of the cyclone casing. The bracket means 83 may form part of the
unit and be attached to the boat in any suitable manner. The unit
must always be attached to the boat so that the inlet orifice 61 is
always below the normal free surface of the body of water and the
cyclone is filled with liquid about to the level N indicated in
FIGS. 5 to 7 of the drawings.
The operation of the unit of FIGS. 5-8 is similar to that explained
with reference to the cyclones shown in FIGS. 1 and 2 of the
drawings and need not be repeated.
The unit shown in FIG. 9 of the drawings, is constructed similarly
to the unit illustrated in FIGS. 5-8 and above described except
that the converging walls 70',71' are not provided with deflector
walls 80 and 81, respectively, and the inner guide surfaces 72',74'
of walls 70',71', respectively, are both straight planar surfaces.
In all other respects the construction of the unit of FIG. 9 is
similar to that of the unit of FIGS. 5 to 8 and it will operate in
a manner similar to the latter.
While we have hereinabove described and illustrated in the
drawings, preferred methods by which the invention may be
practiced, it will be understood that variations therein may be
made without departing from the spirit of the invention, or the
scope of the appended claims.
* * * * *